JPH07122915A - Dielectric resonator circuit - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a dielectric resonator circuit in which microwave and millimeter-wave communication equipment is downsized and has a low profile and the resonance frequency can be finely adjusted in a relatively wide range. [Structure] Microstrip line 3 and dielectric resonator 4
A dielectric resonator circuit including:
A metal piece 5 is provided which is in contact with the ground conductor 1 in the vicinity of, and changes the distance from the resonator 4 to adjust the resonance frequency.
Alternatively, a plurality of land patterns 6 are provided on the dielectric substrate 2 in the vicinity of the resonator 4, and the land pattern 6 at one end connected to the ground conductor 1 and the remaining land patterns 6 are sequentially connected by the metal foil 7. Or by providing the ground pattern 8 on the dielectric substrate 2 in the vicinity of the resonator 4 and moving the metal foil 9 closer to or further away from the resonator 4 from the side facing the resonator 4, or in the vicinity of the resonator 4. The dielectric substrate piece 10 is provided, the ground pattern 11 is provided on the surface thereof, and the resonance frequency is adjusted by moving the substrate piece 10 close to or away from the resonator 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator circuit, and more particularly to a microstrip line provided on a dielectric substrate having a ground conductor on the back surface and magnetic field coupling to a high frequency signal propagating through the microstrip line. And a dielectric resonator circuit that resonates at a predetermined frequency.

In recent years, microwave communication devices have become slimmer and more compact, and along with this, dielectric resonator circuits used in oscillator circuits, filter circuits, duplexers, etc. mounted in microwave communication devices have also been introduced. Miniaturization and low profile are required.

[0003]

2. Description of the Related Art FIG. 8 is a diagram for explaining a conventional dielectric resonator circuit. In FIG. 8, 1 is a ground conductor on the back surface, 2 is a dielectric substrate, 3 is a microstrip line on the surface, and 4 is TE ₀₁ δ.
Dielectric disk (dielectric resonator) that resonates in two modes, 2
2 is a support base with a small dielectric constant ε _r , 23 is a coaxial connector,
Reference numeral 30 ₁ is a metal case for shielding, 30 ₂ is a metallic lid member, and 31 is a metallic screw member. Note that FIG.
Shows a mounting side view (partially transparent view) of a microwave oscillator configured with a GaAs FET element (not shown).

In this type of microwave oscillator, a pure and stable oscillation frequency is obtained by inserting a high-Q dielectric disk 4 in an oscillation feedback circuit. Dielectric disk 4
Is inserted in the feedback circuit by, for example, the magnetic field in the Z direction of the dielectric disk 4 resonating in the TE ₀₁ δ mode and the oscillation element (FE
This is done by coupling the magnetic field around the microstrip line 3 connected to T), but the output power and the oscillation frequency change depending on the size of the coupling (distance between the dielectric disk 4 and the microstrip line 3). , It is necessary to correct this at the time of manufacturing the microwave oscillator.

Conventionally, a screw member 31 (for example, a screw diameter of 6 mm and a screw pitch of 0.5 mm) extending in the direction opposite to the Z-axis from the lid member 30 ₂ on the upper surface is moved closer to or further from the dielectric disk 4 so that the dielectric disk 4 is separated from the dielectric disk 4. The magnitude of the coupling with the microstrip line 3 was changed to adjust the oscillation frequency. However, with the above configuration, a considerable space for moving the screw member 31 up and down is provided.
Required above and below ₂ . Moreover, the screw member 31
The thickness of the lid member 30 ₂ must be increased in order to hold the oscillator stably, which hinders downsizing and height reduction of the entire oscillator.

Further, if attention is paid only to the oscillation frequency, it can be adjusted in a comparatively large range, but at the same time, the loss of the resonance system also greatly increases, so that the signal purity deteriorates and the frequency that can be adjusted substantially. The range was relatively narrow. Furthermore, sometimes the fixing position of the dielectric disk 4 may be displaced left and right from the position of the screw member 31, and in such a case, there is also a problem that the oscillation frequency hardly changes even if the screw member 31 is rotated. there were.

The above applies not only to the oscillator using the dielectric resonator circuit, but also to other filter circuits, duplexers, and the like.

[0008]

As described above, in the conventional dielectric resonator circuit, since the resonance frequency is adjusted by using the screw member, the substantial adjustment range of the resonance frequency is not only narrow. However, these structures have hindered the miniaturization and height reduction of microwave communication devices. The purpose of the present invention is to
It is an object of the present invention to provide a dielectric resonator circuit that enables miniaturization and height reduction of microwave and millimeter-wave communication devices, and finely adjusts the resonance frequency in a relatively wide range.

[0009]

The above problems can be solved by the structure shown in FIG. That is, the dielectric resonator circuit of the present invention (1) is magnetically coupled to the microstrip line 3 provided on the dielectric substrate 2 having the ground conductor 1 on the back surface and to the high frequency signal propagating through the microstrip line 3. In the dielectric resonator circuit including a dielectric resonator 4 that resonates at a predetermined frequency, a metal piece 5 that is in contact with the ground conductor 1 in the vicinity of the dielectric resonator 4 and is the dielectric resonator. 4, which adjusts the resonance frequency by moving it closer to or further away from No. 4.

The above problem can be solved by the structure of FIG. That is, the dielectric resonator circuit of the present invention (2) is magnetically coupled to the microstrip line 3 provided on the dielectric substrate 2 having the ground conductor 1 on the back surface and to the high frequency signal propagating through the microstrip line 3 by magnetic field coupling. , A plurality of land patterns 6 provided at predetermined intervals on the dielectric substrate 2 in the vicinity of the dielectric resonator 4 in a dielectric resonator circuit including a dielectric resonator 4 that resonates at a predetermined frequency.
The land pattern 6 at one end is connected to the ground conductor 1, and the remaining land patterns 6 are connected to the metal foil 7.
, Which adjusts the resonance frequency by sequentially connecting.

The above problem can be solved by the structure of FIG. That is, the dielectric resonator circuit of the present invention (3) is magnetically coupled to the microstrip line 3 provided on the dielectric substrate 2 having the ground conductor 1 on the back surface and to the high frequency signal propagating through the microstrip line 3. In the dielectric resonator circuit including a dielectric resonator 4 that resonates at a predetermined frequency, the ground pattern 8 provided on the dielectric substrate 2 in the vicinity of the dielectric resonator 4 is a dielectric pattern. The shape of the side facing the resonator 4 is substantially complementary to the outer shape end of the dielectric resonator 4, and the metal foil 9 is provided close to or away from the dielectric resonator 4 from the facing side. A device for adjusting the resonance frequency is provided.

The above problem can be solved by the structure of FIG. In other words, the dielectric resonator circuit of the present invention (4) is magnetically coupled to the microstrip line 3 provided on the dielectric substrate 2 having the ground conductor 1 on the back surface and to the high frequency signal propagating through the microstrip line 3. In a dielectric resonator circuit including a dielectric resonator 4 that resonates at a predetermined frequency, a dielectric substrate piece 10 provided in the vicinity of the dielectric resonator 4, the dielectric resonator piece being provided on the surface thereof. 4 has a ground pattern 11 in which the shape of the side facing 4 is substantially complementary to the outer shape end of the dielectric resonator 4, and the dielectric substrate piece 10 is brought close to or away from the dielectric resonator 4. To adjust the resonance frequency by means of.

[0013]

In FIG. 1A, the metal piece 5 is moved toward or away from the dielectric resonator 4 while maintaining contact with the ground conductor 1 on the lower surface of the dielectric resonator 4. As a result, the size of the coupling between the microstrip line 3 and the dielectric resonator 4 changes, and the resonance frequency can be finely adjusted. When the adjustment is completed, use solder, adhesive, or a non-metallic screw to attach the metal piece 5
Is fixed to the ground conductor 1.

Preferably, the thickness of the metal piece 5 is thinned or the shape is standardized into several types in advance. Such a metal piece 5 can be arbitrarily and easily arranged around the dielectric resonator 4 or in a vacant area on the lower surface. In this way, the vacant area around the dielectric resonator 4 can be effectively used for effective adjustment. Can be done. In addition, it was confirmed by the examples described later that such a configuration causes a relatively small loss to the resonance system. Therefore, according to the present invention, it is possible to reduce the size and height of a microwave or millimeter wave communication device, and finely adjust the resonance frequency in a relatively wide range. The same applies to the following inventions.

In FIG. 1B, a plurality of land patterns 6 are provided at a predetermined interval on the dielectric substrate 2 near the dielectric resonator 4, and one of the land patterns 6 is provided.
₁ is connected to the ground conductor 1 by, for example, a through hole, and the remaining land patterns 6 ₂ , 6 ₃ are sequentially connected by a metal foil 7 as required. Therefore, fine adjustment of the resonance frequency does not require skill or feeling on the job, and anyone can easily and surely perform fine adjustment.

In FIG. 1C, a ground pattern 8 is provided on the dielectric substrate 2 near the dielectric resonator 4, and the shape of the side facing the dielectric resonator 4 is the outer shape of the resonator 4. The shape should be substantially complementary to the edge. Then, the resonance frequency is finely adjusted by moving the metal foil 9 closer to or further from the dielectric resonator 4 from the facing side. If the ground pattern 8 has such a shape, one or two or more metal foils 9 can be provided in a state where the coupling with the dielectric resonator 4 is large, so that the microstrip line 3 and the dielectric resonator 4 are provided.
It has a great influence on the combination with.

In FIG. 1D, the dielectric resonator 4 is formed on the surface of the dielectric substrate piece 10 provided near the dielectric resonator 4.
The ground pattern 11 is provided so that the shape of the side facing the outer peripheral end of the resonator 4 is substantially complementary. Then, the resonance frequency is finely adjusted by moving the dielectric substrate piece 10 closer to or further from the dielectric resonator 4. According to this structure, by sliding the dielectric substrate piece 10 toward or away from the dielectric resonator 4, a relatively large change can be obtained in the coupling between the ground pattern 11 and the dielectric resonator 4. Therefore, fine adjustment can be easily performed over a relatively wide range.

Further, preferably, a metal case 20 ₁ for mounting the dielectric resonator circuit, and a plurality of kinds of metal lid members 20 _{2 in} which the thickness of the portion protruding inward is changed in several steps at a predetermined pitch. It is configured such that the resonance frequency can be adjusted by replacing the lid member 20 ₂ .

[0019]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals denote the same or corresponding parts throughout the drawings. FIG. 2 is a circuit diagram of the oscillation circuit of the embodiment. In the figure, 4 is a dielectric disk and 21 is a GaAs FET.

A band reflection type oscillating circuit is constructed by coupling the dielectric disk 4 to a position approximately λ / 2 long of the gate side microstrip line of the FET 21. Output R
F _{OU T} is taken out through a strip coupling line from the drain side. FIG. 3 is a mounting view (partially see-through view) of the oscillation circuit of the embodiment, in which the oscillation circuit of FIG. 2 is mounted.

In the figure, 1 is a ground conductor on the rear surface, 2 is a dielectric substrate, 3 is a microstrip line on the surface, 4 is a dielectric having a relative permittivity ε _r = 34, and resonating in the TE ₀₁ δ mode. Disk (dielectric resonator), 22 is the relative permittivity ε
_r = 3.5 support, 21 is GaAs FET, 20 ₁
Is a metal case for shielding, 20 ₂ is a metallic lid member, and 23 is a coaxial connector. It should be noted that the dimensions (unit: mm) of an example of each part are added to the drawings.

The dielectric substrate 2 around the dielectric disk 4 has a notch of 6.0 × 20.5 mm, and the portion of the metal case 20 ₁ appearing in this portion in the description of the present embodiment is grounded. Conductor 1 is used. Further, in FIG. 3B, this microwave oscillator uses a dielectric resonator circuit of each embodiment described later, and as a result, a metal case 20 is provided more than before.
The height of ₁ is drastically reduced, which makes it possible to reduce the size and height of microwave communication equipment. Moreover, as described below, the oscillation frequency can be finely adjusted in a relatively wide range.

FIG. 4 is a view for explaining the dielectric resonator circuit (and its frequency adjusting method) of the first embodiment, in which the metal piece (or metal block) 5 is placed on the ground conductor 1 and the dielectric disk 4 is provided. It shows the case of approaching or moving away from. In (A) in FIG. 4, the metal strip 5 ₁ embodiment the outer diameter 4.8m
m, an inner diameter of 2.8 mm, and a thickness of 0.5 mm.

In this embodiment, one or two of such sizes are used.
By arranging the two metal pieces 5 ₁ and 5 ₂ as shown in FIGS. 4B to 4G, it was possible to adjust the oscillation frequency of the oscillation circuit of FIG. 2 in the direction of increasing it. That is, FIG. 4B shows that when the metal piece 5 ₁ is placed at a position where the distance d ₁ = 5.45 mm measured in the horizontal direction from the circumferential end surface of the dielectric disk 4,
(C) of FIG. 4 shows (D) of FIG. 4 when the distance d ₁ = 0 mm.
Is a distance d ₁ = −1.0 mm (that is, they are overlapped), FIG. 4E shows that the two metal pieces 5 ₁ and 5 ₂ are separated by a distance d ₁ = 1 on both sides of the dielectric disk 4. When placed at a position of 0.0 mm and a distance d ₂ = 1.0 mm, FIG.
Is the distance d ₁ = 0 mm and the distance d ₂ = 0 mm, and FIG. 4G shows the distance d ₁ = −1.0 mm and the distance d.
The case of ₂ = -1.0 mm is shown.

Table 1 shows the oscillation frequency in each of the above cases,
It shows the amount of frequency change, output power, and current consumption,
No. 1 in Table 1 is the original state without the metal piece 5,
Nos. 2 to 7 correspond to (B) to (G) in FIG. 4, respectively.

[0026]

[Table 1]

[0027] As apparent from Table 1, according to the first embodiment, the output power, the frequency variation of maximum approximately + 46MH _Z is obtained within a range where other oscillation characteristics such as current consumption can be tolerated . Incidentally, the conventional screw member 31 of FIG.
Oscillation characteristics (i.e., signal purity deterioration due to the loss increase of the resonance system) In the method according to the variation of about + 30 mH _Z is towards a higher frequency in view of the was limited.

FIG. 5 is a view for explaining the dielectric resonator circuit (and its frequency adjusting method) of the second embodiment, in which the land pattern 6 provided in the vicinity of the dielectric disk 4 is sequentially formed by the copper foil 7. Shows the case of connecting to. In (A) of FIG. 5, the land pattern 6 embodiment the land pattern ₆₁ that is connected to the ground conductor 1 via the through hole, and expand in one direction with a 1.0mm spacing from its end Each of the land patterns 6 _{2 to} 6 ₆ has a size of 1.0 × 1.0 mm.

In this embodiment, the land pattern 6 is
By connecting in sequence as shown in (B) to (E) of FIG.
Adjust to lower the oscillation frequency of the oscillator circuit in FIG.
I was able to. That is, FIG. 5B shows the land pattern 6
₁, 6₂Copper batter 7 with approximately the same size₁When connected by
5C, the land pattern 6 is further shown in FIG.₂, 6₃Between
Copper night 7₂When connected by
Pattern 6₃, 6_FourBetween the nights 7 ₃When connected by
And (E) of FIG._Four，
6_FiveBetween the nights 7_FourShows the case of connecting by
It

Table 2 shows the oscillation frequency in each of the above cases,
It shows the amount of frequency change, output power, and current consumption,
No. 1 in Table 2 corresponds to the original state in which the land patterns are not connected, and Nos. 2 to 5 correspond to (B) to (E) in FIG. 5, respectively.

[0031]

[Table 2]

As is clear from Table 2, according to the second embodiment, the maximum frequency change amount of approximately -15 MH _Z can be obtained within a range in which other oscillation characteristics such as output power and current consumption can be allowed. There is. Incidentally, the conventional screw member 31 of FIG.
The amount of change in the order of -5MH _Z is towards to lower the frequency in view of the oscillation characteristics in the process according to was limited. Figure 6
FIG. 6 is a diagram illustrating a dielectric resonator circuit (and its frequency adjusting method) according to another embodiment.

In FIG. 6A, a ground pattern 8 (in this example, the ground conductor 1 on the back surface is connected by a through hole) is provided on the dielectric substrate 2 near the dielectric disk 4, and the ground pattern 8 is provided. The side of the pattern 8 facing the dielectric disk 4 is formed in a shape substantially complementary to the outer shape end of the dielectric disk 4, and the ground pattern 8 is formed as a pedestal, and one or more of the opposite sides are formed. The case where the resonance frequency is adjusted by providing the metal foils 9 ₁ and 9 ₂ of ( ₁₎ and ( ₂₎ close to or away from the dielectric disk 4 is shown.

In this embodiment, the opposite sides of the ground pattern 8 are provided at a position of about 5.0 mm at a distance measured horizontally from the circumferential end surface of the dielectric disk 4, and the thickness is 0.2 mm from here. , when carried out close to the copper foil 9 _first width 2.0mm to dielectric disk 4 at step approximately 2 mm, 1
Substantially -3MH _Z per step, substantially -15MH _Z is obtained at the maximum frequency variation.

In FIG. 6B, a dielectric substrate piece 10 is provided near the dielectric disk 4, and the dielectric disk 4 is provided on the surface thereof.
The ground pattern 11 is provided so that the shape of the side facing the outer peripheral edge of the dielectric disk 4 is substantially complementary, and
The case where the resonance frequency is adjusted by moving the dielectric substrate piece 10 closer to or further from the dielectric disk 4 is shown.

In this way, the coupling between the dielectric disk 4 and the ground pattern 11 changes relatively greatly due to the sliding of the dielectric substrate piece 10. Further, if both ends of the dielectric substrate piece 10 can be guided and fixed by, for example, metal screws as shown in the figure, the adjustment work becomes easy. Figure 6
6C is similar to the case of FIG. 6B, but the dielectric substrate pieces 10 are doubled. By stacking the dielectric substrate pieces 10 in this manner, the dielectric disk 4 can be bonded at an arbitrary height. Further, even if the supporting position of the dielectric disk 4 is high, the coupling position can be easily adjusted.

FIG. 7 is a mounting diagram of an oscillator circuit of another embodiment.
In the figure, 20 ₂₁ and 20 ₂₂ are lid members. Providing a cover member 20 _21, 20 ₂₂ having different thickness of the portion in several steps with a thickness pitch = 0.5 mm for example inwardly projecting advance, by replace depending on these lid members 20 _21, 20 ₂₂ necessary Further, the frequency can be finely adjusted.

In the above embodiment, the case of using the metal piece 5 and the case of using the copper foil 9 are described separately.
The frequency can be adjusted by combining these methods. Further, the shape and material of the metal piece 5 are not limited to those in the above-mentioned embodiment. The metal piece 5 having an arbitrary shape and material can be used according to the shape of the dielectric resonator 4 and the shape of the empty area around the dielectric resonator 4.

Although the land pattern 6 is shown as an example in the above-mentioned embodiment, the size of each land pattern 6, the pitch between the land patterns, the manner of development, etc. are not limited to those in the above-mentioned embodiment, and may be arbitrary. Further, although the above-mentioned embodiment describes the application example to the oscillator, the dielectric resonator circuit of the present invention can also be applied to other filter circuits, branching filters and the like.

[0040]

As described above, since the dielectric resonator circuit of the present invention has the above-mentioned configuration, it enables miniaturization and low profile of microwave and millimeter wave communication equipment and has a relatively low resonance frequency. Fine adjustment is possible in a wide range.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a circuit diagram of an oscillator circuit according to an embodiment.

FIG. 3 is a mounting diagram of an oscillator circuit according to an embodiment.

FIG. 4 is a diagram for explaining the dielectric resonator circuit of the first embodiment.

FIG. 5 is a diagram illustrating a dielectric resonator circuit according to a second embodiment.

FIG. 6 is a diagram illustrating a dielectric resonator circuit of another embodiment.

FIG. 7 is a mounting diagram of an oscillator circuit of another embodiment.

FIG. 8 is a diagram illustrating a conventional dielectric resonator circuit.

[Explanation of symbols]

1 Ground Conductor 2 Dielectric Substrate 3 Microstrip Line 4 Dielectric Resonator 5 Metal Piece 6 _{1 to} 6 ₃ Land Pattern 7 Metal Foil 8 Ground Pattern 9 Metal Foil 10 Dielectric Substrate Piece 11 Ground Pattern

Claims (5)

[Claims] 1. A microstrip line (3) provided on a dielectric substrate (2) having a ground conductor (1) on its back surface,
A dielectric resonator circuit comprising a dielectric resonator (4) magnetically coupled to a high-frequency signal propagating through the microstrip line (3) and resonating at a predetermined frequency, in the vicinity of the dielectric resonator (4). And a metal piece (5) in contact with the ground conductor (1) for adjusting the resonance frequency by moving the metal resonator closer to or further from the dielectric resonator (4). Resonator circuit. 2. A microstrip line (3) provided on a dielectric substrate (2) having a ground conductor (1) on its back surface,
A dielectric resonator circuit comprising a dielectric resonator (4) magnetically coupled to a high-frequency signal propagating through the microstrip line (3) and resonating at a predetermined frequency, in the vicinity of the dielectric resonator (4). Of the dielectric substrate (2)
A plurality of land patterns (6) provided at predetermined intervals, the land pattern (6) at one end is connected to the ground conductor (1), and the remaining land patterns (6) are formed on a metal foil. A dielectric resonator circuit, characterized in that the resonance frequency is adjusted by sequentially connecting according to (7). 3. A microstrip line (3) provided on a dielectric substrate (2) having a ground conductor (1) on its back surface,
A dielectric resonator circuit comprising a dielectric resonator (4) magnetically coupled to a high-frequency signal propagating through the microstrip line (3) and resonating at a predetermined frequency, in the vicinity of the dielectric resonator (4). Of the dielectric substrate (2)
In the grounding pattern (8) provided above, the shape of the side facing the dielectric resonator (4) is the dielectric resonator (4).
And a metal foil (9) which is close to or away from the dielectric resonator (4) from the opposite side, and which adjusts the resonance frequency. Characteristic dielectric resonator circuit. 4. A microstrip line (3) provided on a dielectric substrate (2) having a ground conductor (1) on its back surface,
A dielectric resonator circuit comprising a dielectric resonator (4) magnetically coupled to a high-frequency signal propagating through the microstrip line (3) and resonating at a predetermined frequency, in the vicinity of the dielectric resonator (4). A dielectric substrate piece (10) provided on the surface of the dielectric resonator (4).
The grounding pattern (11) has a side opposite to that of the outer shape of the dielectric resonator (4), and the dielectric substrate piece (10) is connected to the dielectric resonator (10). 4) A dielectric resonator circuit, characterized in that the resonance frequency is adjusted by bringing the resonance frequency closer or farther. 5. A metal case (20 ₁ ) for mounting the dielectric resonator circuit, and a plurality of metal lid members (20 ₂ ) in which the thickness of the inwardly projecting portion is changed in several steps at a predetermined pitch.
6. The dielectric resonator circuit according to claim 1, further comprising: and adjusting the resonance frequency by replacing the lid member (20 ₂ ).